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What Does a Gas Heating Engineer Do? A gas engineer is an expert who works on appliances and systems that run on natural gas. They can install or maintain these systems and are able deal with any issues that may arise. They must be on the Gas Safe Register to work legally and they must inform the local authority of any work they carry out. This is to prevent gas leaks as well as explosions, fires and carbon monoxide poisoning. Qualifications A gas heating engineer